AI = [:LineBreak = Ambiguous:];
AL = [:LineBreak = Alphabetic:];
BA = [:LineBreak = Break_After:];
+HH = [\u2010]; # \u2010 is HYPHEN, default line break is BA.
BB = [:LineBreak = Break_Before:];
BK = [:LineBreak = Mandatory_Break:];
B2 = [:LineBreak = Break_Both:];
CB = [:LineBreak = Contingent_Break:];
CJ = [:LineBreak = Conditional_Japanese_Starter:];
CL = [:LineBreak = Close_Punctuation:];
-CM = [:LineBreak = Combining_Mark:];
+CMS = [:LineBreak = Combining_Mark:];
CP = [:LineBreak = Close_Parenthesis:];
CR = [:LineBreak = Carriage_Return:];
EB = [[:LineBreak = EB:] \U0001F46A-\U0001F46D\U0001F46F\U0001F91D\U0001F93C];
# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
# list it in the numerous rules that use CM.
-CM = [CM ZWJ];
+CM = [CMS ZWJ];
LB4: BK ÷;
LB5: CR LF;
LB6: . (BK | CR | LF | NL);
LB6.1: [^BK CR LF NL SP ZW] CM* (BK | CR | LF | NL);
+# LB8 break after ZW SP*.
+# Precedes LB7 because both rules will match the sequences like ZW SP,
+# and LB8 must take precedence.
+
+LB8: ZW SP* ÷ [^ZW SP BK CR LF NL];
+
+# Numbers. Equivalent to Tailoring example 8 from UAX 14.
+# Moved up, before LB14, because it can match longer sequences which must take precedence.
+LB25: ((PR | PO)CM*)? ((OP | HY)CM*)? (IS CM*)? NU (CM*(NU | SY | IS))* (CM*(CL | CP))? (CM*(PR | PO))?;
+
# Rules LB14 - LB17.
-# Moved before LB7, because they can match a longer sequence that would also match LB7,
-# for example, the sequence "OP CM SP AL" matches LB14 while the prefix of it,
-# "while only the prefix "OP CM SP" matches LB7.1
+# Moved up, before LB7, because they can match a longer sequence that would also match LB7.
+# For example, the sequence "OP CM SP AL" matches LB14
+# while the prefix of it, "OP CM SP" matches LB7.1
LB14: OP CM* SP* .;
+
+# LB 14a Break before an IS that begins a number and follows a space.
+LB14a: SP ÷ IS CM* NU;
+
+# LB14b × IS
+LB14b.1: [^SP] CM* IS;
+LB14b.2: SP IS;
+
LB15: QU CM* SP* OP;
LB16: (CL | CP)CM* SP* NS;
LB17: B2 CM* SP* B2;
+
+# LB7 Do not break before spaces or zero width space.
+
LB7.1: [^ZW SP] CM* [SP ZW];
LB7.2: [ZW SP] [SP ZW];
-# LB8, ICU differs from UAX-14,
-# ICU: ZW ÷;
-# UAX 14: ZW SP* ÷;
-LB8: ZW ÷;
-
# LB8a
# ZWJ x
# Don't match a CM on the right - let other rules pick up CM sequences, where
LB12a: [^SP BA HY] CM* GL;
-# LB 13 ICU Tailoring, matches tailoring example 8 from UAX 14.
-#
-# LB13.1 [^SP] CM* [CL CP EX IS SY] # original UAX 14 rule.
-# LB13.2 SP CM* [CL CP EX IS SY]
-
-LB13.1: [^NU SP] CM* [CL CP IS SY];
-LB13.2: [^SP] CM* EX;
-LB13.2: SP [CL CP EX IS SY];
-
+# LB 13 Do not break before ‘]’ or ‘!’ or ‘/’, even after spaces.
+LB13.1: [^SP] CM* [CL CP EX SY];
+LB13.2: SP [CL CP EX SY];
# LB 14-17 are moved above LB 7.
LB20.3: CB CM* ZWJ [^CM];
LB20.4: CB CM* ÷;
+# LB 20.09 Don't break between Hyphens and Letters when there is a break preceding the hyphen.
+LB20.09: ^(HY | HH) CM* AL;
+
# Note: Rule 21a must come before 21 to prevent 21.1 from matching HL BA, then
# not picking up the continuing match after the BA from 21a.
LB21a: HL CM* (HY | BA) CM* [^CM CB];
LB24.2: (PR | PO) CM* (AL | HL);
LB24.3: (AL | HL | CM) CM* (PR | PO);
-# Numbers. Equivalent to Tailoring example 8 from UAX 14.
-LB25: ((PR | PO)CM*)? ((OP | HY)CM*)? NU (CM*(NU | SY | IS))* (CM*(CL | CP))? (CM*(PR | PO))?;
LB26.1: JL CM* (JL | JV | H2 | H3);
LB26.2: (JV | H2) CM* (JV | JT);
LB30.2: CP CM* (AL | HL | NU);
# LB30a keep pairs of RI together.
-LB30a.1: RI CM* RI ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HY NS CM];
-LB30a.2: RI CM* RI CM* [CM-ZWJ] ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HY NS CM];
+LB30a.1: RI CM* RI ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HY NS CM];
+LB30a.2: RI CM* RI CM* CMS ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HY NS CM];
LB30a.3: RI CM* RI CM* [BK CR LF NL SP ZW WJ GL CL CP EX IS SY QU BA HY NS ZWJ]?;
# LB30b Do not break between Emoji Base and Emoji Modifier